Well, what do you know, it looks like Apple’s ambitious messaging service unveiled Monday as part of the iOS 5 software is seen as a threat to Research In Motion’s popular BlackBerry Messenger instant messaging protocol for BlackBerry devices. According toTechRadar, investors punished the BlackBerry maker’s stock Tuesday as they digested Apple’s iMessage:

iMessage announced by Apple on Monday will challenge RIM’s highly popular BlackBerry Messenger (BBM) instant chat service which has given the Canadian company an edge over its rivals. The Apple announcement made investors more jittery, plunging RIM stock on both the Toronto Stock Exchange and Wall Street Tuesday. It slipped more than three percent in Toronto to close at $36.92, and 2.8 percent on Nasdaq to close at $37.82.

One of the new iOS features that has been met with great enthusiasm from journalists and developers attending yesterday’s WWDC keynote is AirPlay Mirroring. Apple’s iOS software head honcho Scott Forstall only briefly described it during the keynote talk:

AirPlay Mirroring, you can now mirror your entire iPad 2 right to your television, wirelessly, using Apple TV

Sounds pretty cool and here’s a video of AirPlay Mirroring in action. Check below for more information from Apple and a video showing lag time.

Yesterday, Apple killed MobileMe and replaced it with the iCloud online services suite which will be available free with iOS 5 this Fall. Apple has published a nice Q&A explaining what the transition means to MobileMe subscribers and how the company plans to go about it. Additionally, a notice at http://www.me.com/upgrade says that “you’ll be able to upgrade your account to iCloud soon”. With that in mind, you may want to prep your migration ahead of the Apple-imposed June 30, 2012 cut-off time when the MobilMe service will no longer be available. Wondering how? Turns out there’s a leaked document for that!

Coming this Fall, iOS 5 will bring along a boatload of exciting new stuff designed for the same devices as its predecessor. Specifically, Jobs has confirmed during yesterday’s keynote talk that iOS 5 will run on the iPhone 4 and iPhone 3GS, iPad and iPad 2 and third- and fourth-generation iPod touch. If history is anything to go by, some of the new features won’t work on older devices due to constrained resources.

Unfortunately, the iOS 5 features page reveals nothing about possible limitations on legacy hardware. Bloggers, however, are beginning to discover what has been implemented in iOS 5 for iPhone 3GS and what features have been stripped away. Take it from a guy in the below clip, “In my opinion, iOS 5 beta works flawlessly on iPhone 3GS”, he concludes. Let’s begin with what works first.

We’re discovering some very interesting and little advertised new features following yesterday’s unveiling of Apple’s iOS 5 software. For instance, did you know there’s a new setting allowing you to tell your iPhone to blink its LED flash on incoming calls and alerts? We’ve also learned about brand new AssistiveTouch section in Settings where you can control your multi-touch experience and even draw custom gestures. Plus, the four-finger pinch gesture that mimics the functionality of the home button? It’s back!

It originally appeared in the first beta of iOS 4.3, but was disabled in subsequent releases unless you were a registered developer who enabled your device for development in Xcode. Needless to say, the home screen pinch has become a jailbreaker’s favorite tweak and it’s been especially popular with iPad owners because performing multi-fingered gestures felt more natural on the tablet’s larger canvas compared to the iPhone’s smallish screen. Even though Steve Jobs made no mention of them during the keynote talk, Apple has detailed new iPad multitasking gestures on its site:

iOS 5 includes a few new moves and shortcuts to help you get around even quicker on your iPad: Using four or five fingers, swipe up to reveal the multitasking bar, pinch to return to the Home screen, and swipe left or right to switch between apps.

Specifically, Apple featured the home screen pinch twice in their iOS 5 promotional video, seen below (mark 0:28 and 5:43). Now, what about those custom gestures?

Apple just announced iMessage, a new service designed to facilitate easy exchange of all kinds of messages between iOS 5 devices. iMessages has a boat load of features, including typing indications and read and delivery receipts. Plus, it works with text messages, photos, videos, contacts and supports even group messaging. Messages get pushed to all participants as well as all your iOS 5-compliant devices, allowing you to pick up conversation from iPhone to iPad. Incoming message alerts are delivered via the new Notifications Center so you can continue whatever you’re doing as an unobtrusive notification shows up briefly. Fine print? There’s none as iMessage works over both 3G cellular connections and WiFi networks.